The correct arrangement of the parts of digestive system in frog is as follows

Mouth $\rightarrow$ Buccal cavity $\rightarrow$ Oesophagus $\rightarrow$ Stomach $\rightarrow$ Intestine $\rightarrow$ Rectum $\rightarrow$ Cloaca $\rightarrow$ Cloacal aperture.

In frog respiration takes place via two means, i.e., skin and lungs.

Cutaneous respiration occrrs through highly vascular moist skin. It takes place in water as well as land.

Pulmonary respiration through lungs. It takes place outside the water.

In frog respiration takes place via two means, i.e., skin and lungs. Cutaneous respiration occrrs through highly vascular moist skin. It takes place in water as well as land.

Pulmonary respiration through lungs. It takes place outside the water.

Special venous connection between liver and intestine is called hepatic portal system and venus connection between the kidney and the lower parts of the frog is called renal portal system.

Hepatic or gastric caecae are 6-8 narrow and hollow blind tubules called is present at the junction of foregut and midgut. The hepatic caecae are similar to vertebrate liver, secretes digestive juices and help in the digestion.